Yeah same problem. After every game I need to leave the party and join again. When I play solo I need to turn off the game. And sometimes when I join some grop with 1 other person and then another person joins I can't see the last person that joined and can't rdy up.
Playing on PS4 nad it looks it's happening only on PS4 and not to everyone. My other teammates are always fine.
Got the same bug on PC but sometimes it works after a few minutes with a "squad" thats not ready. Or when i play sometimes it is saying that the partyowner lefted even thought i was solo and my full squad still is in game